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Combine data/text sections: Pad sections to alignment (#197)

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* Combine data/text sections: Pad all sections to 4-byte minimum alignment

* Update x86 test snapshot

* Read and store object section alignment

* Combine data/text sections: Pad sections to more than 4-byte alignment if they have alignment specified
This commit is contained in:
LagoLunatic
2025-05-06 23:47:08 -04:00
committed by GitHub
parent d0e6c5c057
commit f263e490e3
14 changed files with 431 additions and 65 deletions
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15
objdiff-core/src/obj/split_meta.rs
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@@ -3,6 +3,10 @@ use alloc::{string::String, vec, vec::Vec};
use anyhow::{Result, anyhow};
use object::{Endian, ObjectSection, elf::SHT_NOTE};
#[cfg(feature = "std")]
use crate::util::align_data_to_4;
use crate::util::align_size_to_4;
pub const SPLITMETA_SECTION: &str = ".note.split";
pub const SHT_SPLITMETA: u32 = SHT_NOTE;
pub const ELF_NOTE_SPLIT: &[u8] = b"Split";
@@ -190,17 +194,6 @@ where E: Endian
}
}
fn align_size_to_4(size: usize) -> usize { (size + 3) & !3 }
#[cfg(feature = "std")]
fn align_data_to_4<W: std::io::Write + ?Sized>(writer: &mut W, len: usize) -> std::io::Result<()> {
const ALIGN_BYTES: &[u8] = &[0; 4];
if len % 4 != 0 {
writer.write_all(&ALIGN_BYTES[..4 - len % 4])?;
}
Ok(())
}
// ELF note format:
// Name Size | 4 bytes (integer)
// Desc Size | 4 bytes (integer)